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Outcome

Proposal:

At my family’s home, we have legendary pizza nights. We gather all kinds of ingredients and make our own pizza dough. Each person assembles their favorite toppings on the pizza (my favorite is pear and gorgonzola cheese). My dad cooks them on the Big Green Egg, a wood smoker that’s in our backyard. However, each pizza takes a 3-4 minutes to cook, so my dad is constantly running from the kitchen to the backyard to replace pizzas. I want to make a temperature sensor with a glanceable LED so he know how much time is left on the timer without having to go outside to check.

Parts:

Temperature sensor
RGB LED
Button
Particle
USB cable
Breadboard
Wires

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Pizza Night Timer code

Important! Be sure to import the Onewire and Dallas temperature libraries into your source folder when running this code.

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// Our button wired to D0
int buttonPin = D4;
int redPin = D0;    // RED pin of the LED to PWM pin **A0**
int greenPin = D1;  // GREEN pin of the LED to PWM pin **D0**
int bluePin = D2;   // BLUE pin of the LED to PWM pin **D1**
int redValue = 255; // Full brightness for an ANODE RGB LED is 0, and off 255
int greenValue = 255; // Full brightness for an ANODE RGB LED is 0, and off 255
int blueValue = 255; // Full brightness for an ANODE RGB LED is 0, and off 255</td>
int length = 20000; //timer length
bool timerOn = false;

// This #include statement was automatically added by the Spark IDE.
#include "OneWire.h"

// This #include statement was automatically added by the Spark IDE.
#include "spark-dallas-temperature.h"
#include <math.h>

// -----------------
// Read temperature
// -----------------

// Data wire is plugged into port 5 on the Arduino
// Setup a oneWire instance to communicate with any OneWire devices (not just Maxim/Dallas temperature ICs)
OneWire oneWire(D5 );

// Pass our oneWire reference to Dallas Temperature.
DallasTemperature dallas(&oneWire);

// Create a variable that will store the temperature value
double temperature = 0.0;
double temperatureF = 0.0;



unsigned long t = -1;

void setup()
{
  // Set up our RGB LED pins for output
  pinMode( redPin, OUTPUT);
  pinMode( greenPin, OUTPUT);
  pinMode( bluePin, OUTPUT);
  // For input, we define the
  // pushbutton as an input-pullup
  // this uses an internal pullup resistor
  // to manage consistent reads from the device
  Serial.begin(9600);
  pinMode( buttonPin , INPUT_PULLUP); // sets pin as input

  // Register a Particle variable here
  Particle.variable("temperature", &temperature, DOUBLE);
  Particle.variable("temperatureF", &temperatureF, DOUBLE);

  // setup the library
  dallas.begin();

}

void loop() {
  //create a variable for time and print it
  // find out if the button is pushed
  // or not by reading from it.
  int buttonState = digitalRead( buttonPin );
  // remember that we have wired the pushbutton to
  // ground and are using a pulldown resistor
  // that means, when the button is pushed,
  // we will get a LOW signal
  // when the button is not pushed we'll get a HIGH

  // Request temperature conversion

  dallas.requestTemperatures();

  // get the temperature in Celcius
  float tempC = dallas.getTempCByIndex(0);
  // convert to double
  temperature = (double)tempC;

  // convert to Fahrenheit
  float tempF = DallasTemperature::toFahrenheit( tempC );
  // convert to double
  temperatureF = (double)tempF;


  if( buttonState == LOW and timerOn != true)
  {
    //if the button is pushed and the timer isn't on, turn the timer on
    t = millis();
    timerOn = true;
    //and say the temperature
    Particle.publish("temperature", tempC);
    Serial.print( "Temp in C = ");
    Serial.print(tempC);
    Serial.print( "\t\t F = ");
    Serial.println( tempF );
    //then fade the LED
    ledFade(length);

  }else if(buttonState == LOW and timerOn == true and (millis()-t) >= length){
    //the time has run out, turn the led to the final Color
    setRGBColor(0,255,0);

  }else if(buttonState == HIGH){
    //otherwise, turn the timer and the LED off and set t to 0
    timerOn = false;
    setRGBColor(0,0,0);
}
  delay(500);

}

void ledFade(int z){
  //fade the LED here
  float delayTime =  z/255.0; //set the length of timer of the number of steps
  Serial.println(delayTime);
  for (int y = 0; y<= 255; y++){
      setRGBColor(0, y, 255-y);
      delay(delayTime);
    }
  }


void setRGBColor( int r, int g, int b ){
  redValue = r;
  greenValue = g;
  blueValue = b;
  analogWrite(redPin, 255 - redValue);
  analogWrite(greenPin, 255 - greenValue);
  analogWrite(bluePin, 255 - blueValue);
}

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Pizza Night Timer code

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